1889800640 has 336 divisors, whose sum is σ = 5759695872. Its totient is φ = 585252864.

The previous prime is 1889800639. The next prime is 1889800643. The reversal of 1889800640 is 460089881.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1889800591 and 1889800600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889800643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14880257 + ... + 14880383.

It is an arithmetic number, because the mean of its divisors is an integer number (17141952).

Almost surely, 2^1889800640 is an apocalyptic number.

1889800640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1889800640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2879847936).

1889800640 is an abundant number, since it is smaller than the sum of its proper divisors (3869895232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1889800640 is a wasteful number, since it uses less digits than its factorization.

1889800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 1889800640 is about 43471.8373202698. The cubic root of 1889800640 is about 1236.3421164861.

The spelling of 1889800640 in words is "one billion, eight hundred eighty-nine million, eight hundred thousand, six hundred forty".